I would like to put up a counterpoint to jhungmr's review. The mouse controls are fine, and the platforming focus around the hook gimmick is wonderful. I just have a problem with a few levels which feel extremely drawn out for no good reason.
For example, level 21. We have a terrible safety net (a moving platform that takes a miracle to jump on) that comes after an extremely easy part of the level, and before an extremely hard part. This results in a ton of wasted time trying to complete the hard part of this level because the easy part is so damn long. It feels like a fake challenge when this kind of issue exists.
It's too bad though, because level 21 feels like a great challenge. It's ruined however with this problem, as it takes several hours to pass because players keep dying.
Also, many of the jumps feel like they need a virgin sacrifice to the Aztec gods in order to land. The camera is too small and cramps the player too much. Dirk seriously needs glasses.
Finally, the boss fights should be fixed. These guys are way too easy to exploit and if not exploited they become nearly impossible unless with extremely strong skills of observation. It's the worst possible case in regards to designing combat encounters.
And that's about it, hope you guys make a sequel!